The first arch piece on the Illinois side of the new I-74 bridge was installed on Tuesday, July 28.
Officials say it's attached to the bridge with 48 anchor rods and requires more than 2000 bolts.
29 more arch pieces will need to be installed before the arch is complete.
The Iowa bound arches were completed back in May 2020. That bridge is expected to open to traffic by the end of 2020.